Fixed CPU % calculation of fast benchmarks (#326)

Author: filipecosta90

pyproject.toml

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "redisbench-admin"
-version = "0.7.20"
+version = "0.7.21"
 description = "Redis benchmark run helper. A wrapper around Redis and Redis Modules benchmark tools ( ftsb_redisearch, memtier_benchmark, redis-benchmark, aibench, etc... )."
 authors = ["filipecosta90 <[email protected]>","Redis Performance Group <[email protected]>"]
 readme = "README.md"

redisbench_admin/run/metrics.py

@@ -147,8 +147,8 @@ def from_info_to_overall_shard_cpu(benchmark_cpu_stats):
                 )
                 if avg_cpu_pct is not None:
                     shards_cpu_arr.append(avg_cpu_pct)
-
-            avg_cpu_pct = np.percentile(shards_cpu_arr, 75)
+            if len(shards_cpu_arr) > 0:
+                avg_cpu_pct = np.percentile(shards_cpu_arr, 75)
 
         res[shard_n] = avg_cpu_pct
         if avg_cpu_pct is not None: